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Four-junction superconducting circuit.

Yueyin Qiu1,2, Wei Xiong1,2, Xiao-Ling He3

  • 1Department of Physics, Fudan University, Shanghai 200433, China.

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Summary
This summary is machine-generated.

We present a theory for a four-Josephson-junction superconducting quantum circuit. This circuit offers advantages over the three-junction flux qubit, with potential applications in quantum computing.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting circuits with Josephson junctions are fundamental to quantum computing.
  • Flux qubits, particularly the three-junction design, are a prominent platform.
  • Understanding novel circuit architectures is crucial for advancing quantum technologies.

Purpose of the Study:

  • To develop a theoretical framework for a four-Josephson-junction superconducting quantum circuit.
  • To compare the properties of the four-junction circuit with the established three-junction flux qubit.
  • To identify potential advantages of the four-junction design.

Main Methods:

  • Theoretical modeling of a superconducting loop with four Josephson junctions.
  • Analysis of the circuit's behavior under static and time-dependent magnetic flux.
  • Investigation of both double-well and single-well regimes.

Main Results:

  • The four-junction circuit exhibits similarities and distinct differences compared to the three-junction flux qubit.
  • Specific advantages of the four-junction circuit over its three-junction analogue are demonstrated.
  • The behavior of the four-junction circuit in the single-well regime is explored.

Conclusions:

  • The developed theory provides a valuable tool for analyzing the four-junction superconducting circuit.
  • This work contributes to the understanding of novel superconducting quantum circuit designs.
  • The findings may guide the development of improved quantum computing hardware.